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Finding the Fourth Proportional to 15,805.42, 21,811.48 and 8,731.84

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Solution

The fourth proportional to 15,805.42, 21,811.48 and 8,731.84 is: 12,049.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.42 : 21,811.48 = 8,731.84 : x
  2. Step 2: Convert to fraction form
    15,805.42/21,811.48 = 8,731.84/x
  3. Step 3: Cross multiply
    15,805.42x = 21,811.48 × 8,731.84
  4. Step 4: Simplify right side
    15,805.42x = 190,454,353.52
  5. Step 5: Solve for x
    x = 190,454,353.52/15,805.42
  6. Step 6: Final answer
    x = 12,049.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.